Speaking to BBC News, Major General James Everard, Assistant Chief of the General Staff, said:
We owe a huge apology to the families involved and those who will now be feeling stressful even if it doesn't affect them.
These were just tissue samples that we had failed to recover post-inquest and deal with in line with the families' wishes.
It's a failure of process, nothing more than that, but we absolutely recognise this will cause distress and we're deeply sorry."
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A blustery start to the day will be followed by rain as the morning progresses.
A wet and windy start for many areas, with some heavy rain at times.
Cloud will thicken and rain will strengthen in the early hours, creating a blustery night.